Table 1.

Comparisons of TEA and TPA, TMA or TBA fluxes in the LMT, measured sequentially with self-referencing ion-selective microelectrodes

Mean flux (pmol cm-2 s-1)n sitesN tubulesP
TEA1.88±0.30155<0.001
TMA0.74±0.22
TEA3.01±0.16205<0.001
TPA1.61±0.07
TEA3.57±0.39278<0.001
TBA1.67±0.10
  • Values are means ± s.e.m. All tetraalkylammonium compounds were dissolved in saline at a concentration of 100 μmol l-1. The order of presentation of the compounds was reversed for each tubule. TBA, tetrabutylammonium; TEA, tetraethylammonium; TMA, tetramethylammonium; TPA, tetrapropylammonium; LMT, lower Malpighian tubule.